BS EN ISO 13162:2015 PDF

1   Scope This International Standard specifies the conditions for the determination of 14 C activity concentration in samples of environmental water or of 14 C-containing water using liquid scintillation counting. The method is applicable to the analysis of any organic molecule soluble in water that is well mixed with the scintillation cocktail. It does not apply to micelles or “large” particles (lipids, fulvic acid, humic acid, etc.) that are inadequately mixed with the scintillation cocktail and the water. Some beta energy is lost without any excitation of the scintillation cocktail and the results are underestimated. The method is not applicable to the analysis of organically bound 14 C, whose determination requires additional chemical processing (such as chemical oxidation, combustion). It is possible to determine 14 C activity concentrations below 10 6 Bq l −1 without any sample dilution.